Gas-engine valve.



G.' W. CRAWFORD. GAS ENGINE VALVE. APPLIOATIQH FILED APB.' ze. 191s.

Fa: F' .4 fi .5

Y ez

/T/VESSES 'l y vser Patented 1\Tm1.10 ,1914.4

piston.

UNITED STATES PATENT oEEioE.

' GUY w. CRAWFORD, or FREMONT', MICHIGAN.

` GAS-ENGINE VALVE.

Specification of Letters Patent.

Patented Nov. 10, 1914.

Application `filed April 26, 191,3. Serial No. 763,780,

To all whom it may concern:

Be it known that I, GUY-W. CRAWFORD, a citizen of the United States, and' a resident of Fremont, in the county of Newaygo and State of Michigan, have made certain new and useful Gas-Engine Valves, of which the following is a specification.

My invention relates to valves particu-4 larly adapted for use in connection with gas engines, my object being to provide a rotary valve of novel construction whereby it will be self-balancing and self-grinding. The means by which I accomplish the above object are shown in the accompanying drawing, in which- Figure l is a vertical longitudinal section through a gas engine provided-with Referring now tolthese figures, A designates the cylinder of a conventional upright gas engine, which is provided at its upper end with a rounded lwall A', the sides of which are provided with circularopenings and internal threads. This rounded wall A', as may be plainly seen, forms a substantially 'annular valve chamber a' in open communication with the upper end of the working chamber a of the engine, in which is located the. usual piston B connected by a pitman Z2 to the lower crank shaft C, this latter being provided eXteriorly of the engine cylinder with a sprocket wheel c. The axis of the annular valve chamber a extends at right angles to that of the engine cylinder a, and through the bearings of caps Dand D', the latter of which is provided with an exhaust port d at one side of its center, and with an intake port d' above its center. These caps D-D' threadedly engage within the side openings of the valve casing formed by the rounded wall A', as before mentioned, and through their bearings extends the rotary valve stem Improvements inv or shaft E' upon which is secured the valve E positioned between the caps. This valve Eis circular in form and slightly less in diameter than that of its chamber a', and

is centrally and annularly grooved in order to provide side iianges e and e', each of which is provided with a similar recess 62.5

The spindle or shaft E is provided at an exterior point with a sprocket Wheel e3, this sprocket wheel being, with a four cycle type of engine as I have shown, twice the size of the crank shaft sprocket wheel -c and'con'nected to the latter by a sprocket chain F. l

In assembling the parts, caps D and D are in ythe first instance adjusted so that their inner surfaces engage the outer side surfaces of the valve flanges e and e' snugly and evenly whereby to prevent'leakage, the

valve being thereafter perfectly balanced `m operation by virtue of thepressure whicl'i" is freely circulated entirely therearound from the working cylinder of the engine, and presses evenly against the inner surfaces of the ianges e and e'.

The spark plug G is threaded in the top l of the valve casing, as shown in Figs. 1 and '2, and is controlled by make and break devices indicated at G', on the valve spindle or shaft E', and due to this fact I pref-.

erably form the intake port d above the center of the valve chamber whereby the en tering gas will circulate around the valve E and. exercise-a needful cooling effect upon the same. The valve E rotating in uniform relation with the piston B will uncover the ports d' upon the suction stroke of the piston, and rotating clockwise through the compression and explosion strokes of the piston will uncover the port d during theexhausting stroke, all of which may be plainly seen by a comparison of Figs. 3, 4

and 5.

I claim z- The combination with an' engine cylinder.

providedA at one end with a rounded wall open at its sides and forming a substantially annular valve chamber in open. communication with the working chamber of the engine cylinder, of a valve mounted in the valve chamber and comprising a substantially circular 1nembcr having a central annular groove forming similar side flanges around which pressure may freely circulate whereby to balance the valve sidewise, each of which auges is provided with a recess or cut out portion whereby to inbearings whereby to support the valve shaft,

sure endwise balance, a valve shaft eXtendand one of said caps being provided with ing through the valve chamber and on intake and exhaust ports.

which the said valve is mounted, and caps GUY W CRAWFORD. closing the sides of the valve casing and Witnesses: f engaging the 'sides of thevalve, said caps JOHN E. NASH,

being provided with substantially central FLOYD J. BUNCH. 

